Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 407,620	$ 436,952
Interest-bearing deposits in other financial institutions	190,881	156,693
Federal funds sold and securities purchased under agreements to resell	31,160	27,810
AFS investment securities, at fair value	3,504,777	2,742,025
HTM investment securities, net, at amortized cost	3,938,877	3,960,398
Equity Securities, FV-NI and without Readily Determinable Fair Value	30,883	25,216
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	271,637	295,496
Residential loans held for sale	38,083	20,383
Commercial loans held for sale	15,000	0
Loans	29,848,904	28,799,569
Allowance for loan losses	(338,750)	(312,720)
Tax credit and other investments	263,583	276,773
Premises and equipment, net	374,866	376,906
Bank and corporate owned life insurance		676,530
Goodwill	1,104,992	1,104,992
Other intangible assets, net	44,877	49,282
Mortgage servicing rights, net	80,449	77,351
Interest receivable	159,185	144,449
Other assets	573,870	547,621
Total assets	41,219,473	39,405,727
Liabilities and stockholders' equity
Noninterest-bearing demand deposits	6,565,666	7,760,811
Interest-bearing deposits	25,448,743	21,875,343
Total deposits	32,014,409	29,636,154
Federal funds purchased and securities sold under agreements to repurchase	325,927	585,139
Commercial paper	15,327	20,798
FHLB advances	3,630,747	4,319,861
Allowance for unfunded commitments	38,276	38,776
Accrued expenses and other liabilities	537,640	541,438
Total liabilities	37,096,599	35,390,237
Stockholders’ equity
Preferred equity	194,112	194,112
Common stock	1,752	1,752
Surplus	1,708,303	1,712,733
Retained earnings	3,025,637	2,904,882
Accumulated other comprehensive (loss)	(291,642)	(272,799)
Treasury stock, at cost	(515,287)	(525,190)
Total common equity	3,928,762	3,821,378
Total stockholders’ equity	4,122,874	4,015,490
Total liabilities and stockholders’ equity	$ 41,219,473	$ 39,405,727
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Preferred shares issued and outstanding	200,000	200,000
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Common shares issued	175,216,409	175,216,409
Common shares outstanding	150,918,628	150,444,019
Preferred shares, par value	$ 1.00	$ 1.00
Common shares, par value	$ 0.01	$ 0.01
Fair Value, Inputs, Level 2
Assets
AFS investment securities, at fair value	$ 3,394,824	$ 2,632,647
Equity Securities, FV-NI and without Readily Determinable Fair Value	5,000	0
Bank and corporate owned life insurance	678,578	676,530
Liabilities and stockholders' equity
FHLB advances	3,630,747	4,319,861
Other long-term funding	534,273	248,071
Fair Value, Inputs, Level 3
Assets
Equity Securities, FV-NI and without Readily Determinable Fair Value	19,231	19,225
Loans, net	29,510,153	28,486,849
Mortgage servicing rights, net	$ 80,449	$ 77,351